Add reference to repo and update doc link

Author: ysndr

src/posts/code/git-hooks.md

@@ -4,7 +4,7 @@ authors:
 date: 2021-12-02
 title: Hooking up with Git
 subtitle: Managing git hooks with nix
-tags: nix, snippets, 
+tags: nix, git, code, github 
 description: Git hooks can be useful, tracking and managing them with Nix makes removes the barrier of using them.
 image: https://images.unsplash.com/photo-1621298516851-047f72b40bd7?ixlib=rb-1.2.1&q=80&fm=jpg&crop=entropy&cs=tinysrgb&w=1920
 status: published
@@ -18,6 +18,12 @@ Git hooks are very useful in theory e.g. to enforce style guidelines of code bei
 
 The presented approach does not solve the underlying issue of mutability but makes git-hooks more trackable and easily appliable.
 
+:::{.note header="Flake"}
+An up-to-date version of the presented approach can be [found on GitHub](https://github.com/ysndr/nix-git-hooks).
+
+Please file issues or PRs if you like the project and want to contribute.
+:::
+
 # The big picture
 
 Let me present a full-fledged example first, the functions are individually posted down in the [appendix](#appendix).
@@ -131,7 +137,7 @@ hookInstaller =  installGitHooks { pre-commit = [rustFormatHook]; }
 
 This will run all commands under `\${rustFormatHook}/bin/*` for `pre-commit` events.
 
-The event types can be arbitrary but have to comply with [actual git hooks](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks) to be run.
+The event types can be arbitrary but have to comply with [actual git hooks](https://git-scm.com/docs/githooks) to be run.
 
 Finally, add the installer (and optionally the uninstall-command) to your dev shell as input programs. You can choose to automatically run the installer at entrance to the shell as a `shellHook` or manually by the user.
 
@@ -156,6 +162,7 @@ Nonetheless, this might be of interest for someone and if so thanks for reading.
 
 # Appendix
 
+Copy the respective functions here to include them into your project or checkout the [repository on GitHub](https://github.com/ysndr/nix-git-hooks) avoid copy-pasting and receive upstream bugfixes. 
 ## Installer
 
 ```nix